A vast shower of stones shot down from the sky, as if a rainstorm made of rock were falling.

They plunged at tremendous speed.

These were kinetic stones to begin with, already moving at nearly twenty meters per second. Dropping from a height of ten meters only accelerated them further. Ray then opened the spatial portal flush against the roof. As the stones fell back into the portal one after another, they were accelerated yet again.

All he had added was the kinetic energy converted from anot